PHP資料庫連線的方法是什麼
- php語言
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PHP是一種 HTML 內嵌式的語言,是一種在伺服器端執行的嵌入HTML文件的指令碼語言,語言的風格有類似於C語言,被廣泛地運用。以下是小編為大家搜尋整理的PHP資料庫連線的方法是什麼,希望能給大家帶來幫助!更多經常內容請及時關注我們應屆畢業生考試網!
4.1 連線
if ($conn=Ora_Logon("user@TNSNAME","password"))
{
echo "SUCCESS ! Connected to database ";
}
else
{
echo "Failed :-( Could not connect to database ";
}
Ora_Logoff($conn);
phpinfo();
?>
以上程式碼使用TNSNAME(在你的檔案中指明)定義的`Oracle資料庫名稱、使用者名稱稱和密碼連線資料庫。在成功連線的基礎上,ora_logon函式返回一個非零的連線ID並儲存在變數$conn中。
4.2 查詢
假設與資料庫已經連線就緒,下面我們就來實際的應用對資料庫的查詢。下面的程式碼演示了一個連線並查詢的典型例子:
以下是引用片段:
/*
* 連線資料庫並執行查詢
*/
function printoraerr($in_cur)
{
// 檢查Oracle是否出錯
// 如果存在錯誤則顯示
// 當指標被啟用時每次請求Oracle後呼叫該函式
if(ora_errorcode($in_cur))
echo "Oracle code - "_error($in_cur)." ";
return;
}
/** 主程式 */
if (!($conn=ora_logon("user@TNSNAME","password")))
{
echo "Connection to database failed ";
exit;
}
echo "Connected as connection - $conn
";
echo "Opening cursor ...
";
$cursor=ora_open($conn); printoraerr($cursor);
echo "Opened cursor - $cursor
";
$qry="select user,sysdate from dual";
echo "Parsing the query $qry ...
";
ora_parse($cursor,$qry,0); printoraerr($cursor);
echo "Query parsed
";
echo "Executing cursor ...
";
ora_exec($cursor); printoraerr($cursor);
echo "Executed cursor
";
echo "Fetching cursor ...
";
while(ora_fetch($cursor))
{
$user=ora_getcolumn($cursor,0); printoraerr($cursor);
$sysdate=ora_getcolumn($cursor,1); printoraerr($cursor);
echo " row = $user, $sysdate
";
}
echo "Fetched all records
";
echo "Closing cursor ...
";
ora_close($cursor);
echo "Closed cursor
";
echo "Logging off from oracle...
";
ora_logoff($conn);
echo "Logged off from oracle
";
?>
(譯者注:以上程式碼段缺少註釋,請讀者參考PHP Manual的Oracle資料庫函式部分)
4.3 顯示結果
以下程式碼演示了怎樣查詢資料庫並將結果輸出:
以下是引用片段:
function printoraerr($in_cur, $conn)
{
// 檢查Oracle是否出錯
// 如果存在錯誤則顯示
// 當指標被啟用時每次請求Oracle後呼叫該函式
// If it encountered an error, we exit immediately
if(ora_errorcode($in_cur))
{
echo "Oracle code - "_error($in_cur)."
n";
ora_logoff($conn);
exit;
}
return;
}
function exequery($w_qry,$conn)
{
$cursor=ora_open($conn); printoraerr($cursor,$conn);
ora_parse($cursor,$w_qry,0); printoraerr($cursor,$conn);
ora_exec($cursor); printoraerr($cursor,$conn);
$numrows=0;
$w_numcols=ora_numcols($cursor);
// 顯示頭部
echo "
";
for ($i=0;$i<$w_numcols;$i++)
{
$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";
echo " "_columnname($cursor,$i)." ";
}
echo "
";
while(ora_fetch($cursor))
{
echo " ";
for ($i=0;$i<$w_numcols;$i++)
{
$align=(ora_columntype($cursor,$i)=="NUMBER")?"RIGHT":"LEFT";
if(ora_columntype($cursor,$i)=="LONG")
echo " ".
ora_getcolumn($cursor,$i)."
";
else
echo " "_getcolumn($cursor,$i)." ";
printoraerr($cursor,$conn);
}
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